My textures won't show up in BGE
There should be an option within the render settings to display as either Multitexture or GLSL. To change this option, while your mouse is over the 3D viewport, press the "N" key. In the sidebar that appears, open one of the drop down menus (I believe it's the one labeled Display) and you will find an option that toggles between the Multitexture and GLSL rendering systems. Click GLSL if it's not already selected and you should see your textures appear.